Fixed controller crashes on unsupported update types

spec/telegram/bot/updates_controller_spec.rb

@@ -102,6 +102,11 @@ RSpec.describe Telegram::Bot::UpdatesController do
       it { should eq [false, payload_type, payload.values_at(:data)] }
     end
 
+    context 'when payload is not supported' do
+      let(:payload_type) { '_unsupported_' }
+      it { should eq [false, :unsupported_payload_type, []] }
+    end
+
     context 'when payload is message' do
       let(:payload_type) { 'message' }
       let(:payload) { {'text' => text} }